--- a/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.hpp	Fri Sep 04 17:33:56 2015 -0700
+++ b/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.hpp	Tue Aug 18 21:32:21 2015 +0200
@@ -723,7 +723,7 @@
 
  private:
   // Support for parallelizing young gen rescan in CMS remark phase
-  ParNewGeneration* _young_gen;  // the younger gen
+  ParNewGeneration* _young_gen;
 
   HeapWord** _top_addr;    // ... Top of Eden
   HeapWord** _end_addr;    // ... End of Eden
@@ -772,9 +772,9 @@
  private:
 
   // Concurrent precleaning work
-  size_t preclean_mod_union_table(ConcurrentMarkSweepGeneration* gen,
+  size_t preclean_mod_union_table(ConcurrentMarkSweepGeneration* old_gen,
                                   ScanMarkedObjectsAgainCarefullyClosure* cl);
-  size_t preclean_card_table(ConcurrentMarkSweepGeneration* gen,
+  size_t preclean_card_table(ConcurrentMarkSweepGeneration* old_gen,
                              ScanMarkedObjectsAgainCarefullyClosure* cl);
   // Does precleaning work, returning a quantity indicative of
   // the amount of "useful work" done.
@@ -797,7 +797,7 @@
   void refProcessingWork();
 
   // Concurrent sweeping work
-  void sweepWork(ConcurrentMarkSweepGeneration* gen);
+  void sweepWork(ConcurrentMarkSweepGeneration* old_gen);
 
   // (Concurrent) resetting of support data structures
   void reset(bool concurrent);
@@ -1120,10 +1120,8 @@
   MemRegion used_region_at_save_marks() const;
 
   // Does a "full" (forced) collection invoked on this generation collect
-  // all younger generations as well? Note that the second conjunct is a
-  // hack to allow the collection of the younger gen first if the flag is
-  // set.
-  virtual bool full_collects_younger_generations() const {
+  // the young generation as well?
+  virtual bool full_collects_young_generation() const {
     return !ScavengeBeforeFullGC;
   }
 
@@ -1153,9 +1151,8 @@
 
   virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes) const;
 
-  // Inform this (non-young) generation that a promotion failure was
-  // encountered during a collection of a younger generation that
-  // promotes into this generation.
+  // Inform this (old) generation that a promotion failure was
+  // encountered during a collection of the young generation.
   virtual void promotion_failure_occurred();
 
   bool should_collect(bool full, size_t size, bool tlab);